Question

An impure sample of FeS of mass 0.85 g was analysed. The FeS was dissolved in HCI and the

resulting H₂S reacted with dilute solution of AgNO3. The precipitate of Ag2S produced was
filtered off, washed and gently dried. The mass of Ag2S was 1.32 g.
(1) Write balanced equations for the reaction of FeS(s) with HCl(aq) and for the reaction of
H₂S(g) with AgNO3(aq).

Answer 1

The balanced chemical equations for the reactions are FeS with HCl producing FeCl₂ and H₂S gas, and H₂S with AgNO₃ producing Ag₂S precipitate and HNO₃.

Step-by-step explanation:

The balanced chemical equations for the reactions described are:

1. FeS(s) + 2HCl(aq) → FeCl₂(aq) + H₂S(g)
2. H₂S(g) + 2AgNO₃(aq) → Ag₂S(s) + 2HNO₃(aq)

In the first reaction, FeS reacts with hydrochloric acid (HCl) to form ferrous chloride (FeCl₂) and hydrogen sulfide (H₂S) gas. In the second reaction, hydrogen sulfide reacts with a dilute solution of silver nitrate (AgNO₃) to form silver sulfide (Ag₂S), the precipitate, and nitric acid (HNO₃).